I just added one a moment ago. Went smoothly. Just followed the directions. Plugged in the PA100, used the ST app to search for new devices, then tapped the button on the PA-100 once. Within a few seconds the ST app saw it as a Z-Wave Switch. Renamed it and now it’s just another device in the config.
I use some of these to toggle power to some devices that seem to get hung up now and then. A couple of Qi wireless chargers seem to forget how to do their thing if they haven’t been power-cycled every couple of weeks. No matter, now they’re in a Smart Lighting setting (in the Smart App tab). It’s set up to power off at 12pm and then back on at 12:01pm.
My only complaint is the indicator light on the PA100 illuminates itself when the circuit is powered OFF. Seems kind of backwards, but I guess they’re angling for lighting up the indicator so you can SEE it to manually power it back on again. Dumb, I know, but whatever.